Lock



FIG. 1 is a right front perspective view illustrating a lock;

FIG. 2 is a left front perspective view of the lock;

FIG. 3 is a front view of the lock;

FIG. 4 is a left side view of the lock;

FIG. 5 is a right side view of the lock;

FIG. 6 is a rear view of the lock;

FIG. 7 is a top view of the lock; and,

FIG. 8 is a bottom view of the lock. 

CLAIM The ornamental design for a lock, as shown and described. 